Collaborative editing (#1660)

server/collaboration/utils/markdownToYDoc.js

@@ -0,0 +1,42 @@
+// @flow
+import { Node, Fragment } from "prosemirror-model";
+import { parser, schema } from "rich-markdown-editor";
+import { prosemirrorToYDoc } from "y-prosemirror";
+import * as Y from "yjs";
+import embeds from "../../../shared/embeds";
+
+export default function markdownToYDoc(
+  markdown: string,
+  fieldName?: string = "default"
+): Y.Doc {
+  let node = parser.parse(markdown);
+
+  // in rich-markdown-editor embeds were created at runtime by converting links
+  // into embeds where they match. Because we're converting to a CRDT structure
+  // on the server we need to mimic this behavior.
+  function urlsToEmbeds(node: Node): Node {
+    if (node.type.name === "paragraph") {
+      for (const textNode of node.content.content) {
+        for (const embed of embeds) {
+          if (textNode.text && embed.matcher(textNode.text)) {
+            return schema.nodes.embed.createAndFill({
+              href: textNode.text,
+            });
+          }
+        }
+      }
+    }
+
+    if (node.content) {
+      const contentAsArray =
+        node.content instanceof Fragment ? node.content.content : node.content;
+      node.content = Fragment.fromArray(contentAsArray.map(urlsToEmbeds));
+    }
+
+    return node;
+  }
+
+  node = urlsToEmbeds(node);
+
+  return prosemirrorToYDoc(node, fieldName);
+}